JP4006984B2 - Nuclear power plant construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing two nuclear power plants.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 9-68588 discloses a configuration called a twin implant in which an operating floor (hereinafter simply abbreviated as “operation floor”) in a reactor building is shared by two nuclear power plants.
[0003]
In addition, as a method of constructing two nuclear power plants adjacent to each other, a specific construction machine or manpower can be placed at a specific time by starting the construction of the succeeding plant with a time difference from the preceding plant that has begun construction in advance. It has been published as a republished patent of International Publication No. WO97 / 11467.
[0004]
[Problems to be solved by the invention]
In the future, in the construction of nuclear power plant twin implants that will be constructed with a difference in construction time, such as the operation floor inside the reactor building, the facilities that can be shared by the two implants will be shared. Of course, there are cases where fuel loading work is being carried out and construction work is being carried out in an unmanaged area in the operation floor on the subsequent plant side.
[0005]
When the construction of the succeeding plant is rushed and the entire common operation floor is set as the management area, the operation work of the subsequent plant is subject to restrictions on the working time in the management area, and the construction process and construction costs are affected. Need to be divided into managed / unmanaged areas.
[0006]
Also, in cases where the preceding plant is in operation and the subsequent plant is fuel-loaded in the operation control area, it is necessary to study how to set the secondary containment facility boundary in the event of a trouble in the reactor containment vessel of the preceding plant. It becomes.
[0007]
Therefore, the main object of the present invention is to provide a method for constructing a twin implant with an optimum boundary in the construction of the twin implant of a nuclear power plant, and further, an operation method for the twin implant constructed by the construction is provided. It is a secondary purpose to provide.
[0008]
[Means for Solving the Problems]
The main purpose is to provide a nuclear power plant construction method in which a subsequent nuclear power plant is constructed integrally with the preceding nuclear power plant with a delay in the construction of the preceding nuclear power plant. Form a partition from the base mat to the height of the roof, and proceed with the construction of both nuclear power plants on both sides of the partition, and if the preceding nuclear power plant is in operation, When the bulkhead is removed and the operating floor of the preceding nuclear power plant side is covered with a floor, the construction of the subsequent nuclear power plant is proceeded. The operating floor of the power plant is the same for both nuclear power plants. It is of the operating floor is achieved by the construction method of a nuclear power plant.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the nuclear power plant twin implant, two reactor pressure vessels will be deployed in a common reactor building, and a primary containment facility for storing a reactor pressure vessel for each reactor pressure vessel, A secondary containment facility that surrounds the primary containment facility is an ancillary facility and is provided inside the reactor building. Such a implant has a rational design in which the spent fuel pool and the operation floor in the reactor building are shared by the implant.
[0011]
In the construction of the two implants, the construction start on the preceding nuclear power plant 2 (hereinafter simply referred to as the preceding plant) in FIG. 1 is preceded, and a time difference in units of months or years is placed at the beginning, and the preceding plant is The construction of the succeeding plant 3 (hereinafter simply referred to as the succeeding plant) is started before the completion of the process. In the preceding and succeeding plants, the reactor building, which is a facility for storing the reactor pressure vessel, will be described with reference to the drawings. Therefore, the construction of the preceding plant means the construction of the reactor building of the preceding plant and the assembly and installation of internal equipment in the reactor building. The construction of the succeeding plant also means the construction of the reactor building of the succeeding plant and the assembly and installation of the internal equipment in the reactor building. Therefore, in each figure, the display range of the preceding plant 2 is expressed by the range of the first reactor building expressed in the column of claims, and the display range of the subsequent plant 3 is expressed by the column of claims. Means the range of the second reactor building.
[0012]
Hereinafter, construction of a nuclear power plant twin implant according to an embodiment of the present invention will be described with reference to the drawings, taking a reactor building and its internal components as examples. FIG. 1 shows the setting state of the partition wall 5 for the secondary containment facility boundary structure up to the spent fuel pool floor shared by the preceding / following plant. The shared spent fuel pool floor for the secondary containment facility boundary construction of the preceding plant 2 and the succeeding plant 3 in accordance with the building construction of the preceding plant 2 from the mat 1 common to the preceding / following plant to the shared spent fuel pool floor 4 The partition walls 5 up to 4 are set from the mat 1 to the shared spent fuel pool floor 4. Since this time subsequent plant 3 is constructed with a delayed time difference with respect to the preceding plant 2, for example, the construction up to the height of the first floor 6 is in progress.
[0013]
FIG. 2 shows the partition setting situation of the secondary containment facility boundary structure of the shared spent fuel pool floor 4 or more of the preceding / following plant. Shared use in the vertical direction passing through the boundary between the operating plant 10 on the preceding plant side and the operating floor 11 on the succeeding plant 3 side, in accordance with the construction work of the building 7 from the common spent spent fuel pool floor 4 of the preceding plant 2 to the roof 12 A partition 8 inside the spent fuel pool and a partition 9 above the operation floor are set.
[0014]
The partition wall 8 in the shared spent fuel pool and the partition wall 9 above the operation floor are separable. The common spent fuel pool partition wall 8 and the partition wall 9 above the operation floor cut off the operation flow of the preceding plant 2 and the subsequent plant 3 to prevent dust from entering the operation floor of the preceding plant 2 from the subsequent plant 3. Since the succeeding plant 3 is constructed with a time difference from the preceding plant, when the common spent fuel pool partition wall 8 and the partition wall 9 above the operation floor are set, the operation plant 11 on the subsequent plant 3 side is reached. Is under construction.
[0015]
FIG. 3 shows a situation in which the preceding plant 2 is in operation and mechanical work before the management area is set, and the subsequent plant 3 is in the process of building construction from the operation floor to the roof 12. Prior to the completion of the construction of the roof 12 of the preceding plant 2, the overhead crane rail 15 is carried in and installed, and the two overhead cranes 14 are carried in to complete the installation on the overhead crane rail 15. The crane 14 was tested, and in parallel, the operation floor 11 on the succeeding plant 3 side and the operation floor 10 on the preceding plant 2 were partitioned by the partition wall 9 above the operation floor, and the preceding plant 2 of the dust generated by the construction work in the succeeding plant. In order to prevent intrusion into the operation floor 10 on the side, operation machines and electrical work such as in-furnace construction before setting the management area are performed using two overhead cranes 14. Since the construction of the succeeding plant is a construction that is delayed with respect to the construction of the preceding plant, at this time, the succeeding plant 3 is under the construction of the casing from the operation floor wall 17 to the roof 13.
[0016]
Thus, after each partition 5, 8, and 9 was constructed from the mat 1 as the foundation of the reactor building to the height of the roofs 12 and 13, each partition was separated by the partition without being removed. Construction is proceeded individually on both compartments, and after the construction on both compartments is completed, the bulkhead 9 is removed, and the operation floor 11 and the operation floor 10 of both plants are communicated to form an operation floor shared by both plants. . The partition walls 5, 8 and 9 have a function of preventing the transmission of radiation and the passage of radioactive substances continuously in the vertical direction without any gap.
[0017]
Even during the construction work, the operation floor 11 and the operation floor 10 of both plants communicate with each other so that the operation floor can be shared by both plants, so that a wide working environment can be secured, or two overhead cranes 14 can be constructed on one side of the plant. If the user wants to concentrate on the operation, the operation is sequentially advanced from the state shown in FIG. 3 to the state shown in FIGS. In the following, the work proceeding in sequence will be described with reference to FIGS.
[0018]
The work progresses from the state of FIG. 3 to the state of FIG. 4, and the state of FIG. 4 shows the state of the operating and electrical work before setting the management area for both the preceding and subsequent plants. Since the operation is performed using two overhead cranes 14 at the operation of the preceding plant 2 and the subsequent plant 3, first, the bulkhead 9 above the operation floor is temporarily removed, and then the overhead crane 14 operating at the preceding plant 2 is replaced. In order to enable use in the succeeding plant 3, the overhead crane rail 15 on the preceding plant 2 side and the succeeding plant 3 side are continuously connected. In this way, the overhead crane 14 can move between the preceding plant 2 and the succeeding plant 3 so that the two overhead cranes 14 can be shared by both the preceding plant 2 side and the succeeding plant 3 side. To promote construction work.
[0019]
FIG. 5 shows a state in which the operating plant / electrical work after setting the radiation control area is performed on the preceding plant 2 side and the operating plant / electrical work is set on the succeeding plant 3 side before setting the radiation management area. In order to keep the operation floor of the succeeding plant 3 in the unmanaged area, first, the overhead crane rail portion set at the upper end portion of the partition wall 9 above the operation floor is temporarily removed from the overhead crane rail 15.
[0020]
Thereafter, the partition wall 9 that has been temporarily removed is reset on the shared spent fuel pool partition wall 8 in the center of the operation floor. As a result, the operation flow on the preceding plant 2 side and the operation flow on the subsequent plant are blocked. In addition, the overhead crane 14 is set as one usage category for the preceding plant 2 operation work and one for the subsequent plant 3 operation work.
[0021]
FIG. 6 shows a state in which the preceding plant 2 is in operation and the succeeding plant 3 is in an operating machine / electrical work before setting the radiation control area. As a secondary containment facility boundary configuration method in case of trouble in the containment vessel of the preceding plant 2, the bulkhead 9 above the operating floor is removed, and the overhead crane rails 15 on the preceding plant 2 side and the succeeding plant 3 side are connected to follow. The work on the plant 3 side can be propelled by two overhead cranes 14.
[0022]
Next, the operation floor 16 is set on the operation floor 10 on the preceding plant 2 side, and the preceding plant is constituted by the partition wall 5 up to the shared spent fuel pool floor 4, the shared spent fuel pool partition wall 8, and the operation floor 16. 2 and the boundary above the operating floor and the boundary to the succeeding plant 3 are configured.
[0023]
The operating floor 16 is configured by arranging a plurality of plates made of a concrete plate covered with a metal plate. Each plate of the operating floor 16 has a weight and a size that can be handled by the overhead crane 14. A seal is applied between the arranged plates. The operating floor 16 has a function of preventing radiation or radioactive material leaking into the lower portion of the operating floor 16 from leaking into the upper portion of the operating floor 16. In this embodiment, the operating floor 16 also covers the shared spent fuel pool.
[0024]
The plates constituting the operating floor 16 can be suspended and moved by the overhead crane 14. By the movement, it can be removed from the operation floor or spread on the operation floor.
[0025]
After starting the nuclear power plant operation, it is time to open the top of the reactor pressure vessel and replace the nuclear fuel in the reactor pressure vessel, replace it with new fuel, or perform an internal inspection of the reactor pressure vessel Will arrive. At that time, a reactor open state occurs in which the top cover of the reactor pressure vessel is opened. When the furnace is open, radiation and radioactive materials may be scattered in the operating space, so that the operating space is a strict radiation control area.
[0026]
FIG. 7 shows a state in which the reactor pressure vessel is opened after the operation of the preceding plant 2 and the operating machine / electric work is being performed after the radiation control area of the succeeding plant 3 is set. If the operation flow of the preceding plant 2 and the succeeding plant 3 is not separated during the mechanical / electrical work in the operation flow after setting the radiation control area of the succeeding plant 3, the reactor pressure vessel is opened after the operation of the preceding plant 2 and the subsequent operation is performed. The radiation dose of the plant 3 operation floor increases, the specified dose arrival time is advanced, and the work efficiency in the management area of the succeeding plant 3 decreases. In order to suppress the decrease, first, remove the rails in the setting range portion of the bulkhead 9 above the operating floor from the overhead crane rail 15, and then reset the bulkhead 9 above the operating floor that has been temporarily removed to the original state. Thus, the operation floor on the preceding plant 2 side and the operation floor on the subsequent plant side are separated and separated, and then the operation floor floor 16 is removed on the preceding plant 2 side, and the operation is performed in the furnace open state. Carry out mechanical and electrical work under the setting of radiation control areas.
[0027]
The furnace open state occurs even when both plants are operating after the preceding plant and the succeeding plant are completed. For example, this is the state of FIG. That is, FIG. 8 shows the reactor open state of the reactor pressure vessel after the operation of the preceding plant 2 and the operation state of the subsequent plant 3.
[0028]
There is concern that radiation or radioactive material leaks from the subsequent plant 3 into the space above the operating floor due to a trouble in the subsequent plant 3 that is in operation while the operation is performed with the furnace open on the preceding plant 2 side. Is done.
[0029]
Therefore, as a method of configuring the secondary containment facility boundary in the event of a trouble in the reactor containment vessel of the subsequent plant 3 that is in operation, the operation floors 16 are spread over the operation floor on the subsequent plant 3 side, and the bulkheads 5 and 8 and the operation floor are arranged. The subsequent plant 3 is isolated from the operation floor and the preceding plant 2 side by the partition 16. Thus, the boundary of the subsequent plant 3 is constituted by the partition wall 5 up to the shared spent fuel pool floor, the shared spent fuel pool inner partition wall 8, and the operation floor 16 of the subsequent plant 3. This prevents leakage of radioactivity to the preceding plant 2 due to a trouble in the reactor containment vessel on the succeeding plant 3 side. If both plants are operated in this way, maintenance after operation and handling of nuclear fuel can be carried out safely and widely using the operating floor even if the operating floor is shared between both plants and the space above the operating floor is connected between the two plants. .
[0030]
In this way, of the partition walls 5, 8, 9, the partition walls 5, 8 remain even after the construction of the implant is completed, thereby suppressing the transmission of radiation and the passage of radioactive materials. However, in order to completely share the shared spent fuel pool, the partition wall 5 which is a part of the partition walls 5 and 8 may be left and the partition wall 8 may be removed from the shared spent fuel pool.
[0031]
【The invention's effect】
As described above, according to the construction method of the present invention, when the nuclear power plant twin implants that share the operation floor are constructed with a time difference between the plants, the partition walls and the floors are used in accordance with the construction progress. The screw implant can be constructed reasonably and safely while controlling the diffusion of radiation, radioactive material and dust.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a reactor building at an early stage of construction according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a reactor building showing a partition setting state according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of a reactor building showing a situation in which a starting plant according to an embodiment of the present invention is in operation and electrical work before setting a management area, and a subsequent plant is under construction from the operation floor to the roof. is there.
FIG. 4 is an explanatory diagram of a reactor building showing a state during operation of an operating machine and electrical work before setting a management area for both the preceding and succeeding plants according to the embodiment of the present invention.
FIG. 5 is an explanatory diagram of a reactor building showing a state in which the preceding plant according to the embodiment of the present invention is in the operation machine / electric work after setting the management area, and the subsequent plant is in the operation machine / electric work before setting the management area. is there.
FIG. 6 is an explanatory diagram of a reactor building showing a state in which the preceding plant according to the embodiment of the present invention is in operation and the succeeding plant is in an operation machine / electrical work before setting a management area.
FIG. 7 is an explanatory diagram of a reactor building showing a state in which an operating plant and an electric work are being performed after a preceding plant has been operated and a succeeding plant has been set in a management area according to an embodiment of the present invention. .
FIG. 8 is an explanatory diagram of a reactor building showing a state in which the reactor pressure vessel is opened after the operation of the preceding plant according to the embodiment of the present invention and the subsequent plant is operating.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mat, 2 ... Predecessor plant, 3 ... Subsequent plant, 4 ... Shared spent fuel pool floor, 5 ... Bulkhead to shared spent fuel pool floor, 6 ... Subsequent plant 1st floor, 7 ... Shared spent fuel pool Body above floor, 8 ... partition wall in shared spent fuel pool, 9 ... partition above operation floor, 10 ... operation floor of preceding plant, 11 ... operation floor of subsequent plant, 12 ... roof of preceding plant, 13 ... roof of subsequent plant, 14 ... Overhead crane, 15 ... overhead crane rail, 16 ... operating floor, 17 ... following plant operating floor.

Claims (9)

A first nuclear power plant having a first nuclear reactor building for storing a first nuclear reactor pressure vessel, and a second nuclear reactor after the construction of the preceding nuclear power plant is started and before the completion thereof In a method for constructing a nuclear power plant in which both reactor buildings in a subsequent nuclear power plant having a second reactor building for storing a pressure vessel are integrally constructed,
Forming a partition wall that partitions both reactor buildings at the boundary between both reactor buildings,
Proceed with the construction of both nuclear power plants in the compartments on both sides across the bulkhead,
Before the completion of the two nuclear power plants, the bulkhead is removed from the operating floor, and each operating floor of the first reactor building and the second reactor building is used as a common operating floor. Power plant construction method.   In Claim 1, even after the completion of the two nuclear power plants, all or a part of the partition walls on the lower side from the operating floor are left, and the remaining partitions are separated from the first reactor building and the second reactor building. A method of constructing a nuclear power plant with walls shared by the reactor building.   In Claim 1 or Claim 2, in a state where the preceding nuclear power plant is in operation during the construction of the subsequent nuclear power plant, the bulkhead above the operating floor is removed and the bulkhead is partitioned by the bulkhead A construction method of a nuclear power plant, wherein the construction of the subsequent power plant is advanced with the spent fuel pool on the first reactor building side covered with a floor.   4. The nuclear power plant construction method according to claim 1, wherein the partition wall is constructed in accordance with construction of the first reactor building.   In Claim 1 or Claim 2 or Claim 3, when the operating floor on the first reactor building side becomes a radiation control area, a partition wall is provided between the two reactor buildings to shut off the two reactor buildings. A construction method of a nuclear power plant characterized in that the construction work of both nuclear power plants is proceeded in a state in which it has been completed.   4. Dust intrusion from the second reactor building side to the first reactor building side before the operating floor on the first reactor building side becomes a radiation control area in claim 1, 2 or 3 A construction method of a nuclear power plant characterized in that a partition wall is provided at the boundary between both reactor buildings to prevent dust intrusion while it is necessary to prevent dust.   In Claim 1 or Claim 2 or Claim 3, before the radiation control area is set in both the first reactor building and the second reactor building, the operating floor mechanical and electrical work is performed upward from the operating floor. A method for constructing a nuclear power plant, which is performed in a state in which the partition between the operating floors of both reactor buildings is released by removing the bulkhead. In Claim 3, when the preceding nuclear power plant is in operation and the subsequent plant is performing mechanical and electrical work on the operating floor, the spent fuel pour on the first reactor building side divided by the partition wall is used. construction method for a nuclear power plant, characterized in that covering the Le in intervals bed.   In claim 1, 2 or 3, the reactor pressure vessel is opened in the first reactor building, and the radiation control area is set in the second reactor building. A construction method of a nuclear power plant characterized in that the partition between both reactor buildings is cut off by a partition wall during operating floor machine / electrical work.

Images